Kennametal 1544798 Spiral Point Tap 2-56 Unc Hss Tin

Product Description

The KENNAMETAL 1544798 is a spiral point tap designed for threading 2-56 UNC holes in metalworking applications. It is manufactured from high speed steel (HSS) with a titanium nitride (TiN) coating that improves surface hardness and wear resistance during tapping operations. The plug chamfer style provides a gradual thread lead-in, making it suitable for through-hole applications where the tap can advance freely past the bottom of the hole. With 2 flutes and a right-hand thread direction, this tap pushes chips ahead of the cutting edge rather than packing them in the flute, reducing breakage risk in small-diameter work. Machinists and tool-and-die technicians are the primary users.

This tap is suited for use in ferrous materials including cast iron, ductile iron, stainless steel, and steel. The 2-56 UNC thread form is common in small precision assemblies, electronics enclosures, and instrument hardware where fine mechanical fastening is required. Its compact overall length of 1.75 inches and thread length of 0.438 inches make it appropriate for shallow-to-moderate through-hole depths on manual tapping equipment or CNC machining centers without coolant-through capability. The H2 thread limit keeps finished thread tolerances within Class 2B fit requirements for standard fastener mating.

Key Features

• Spiral point geometry pushes chips forward, reducing clogging in through-hole tapping
• TiN coating increases surface hardness and extends tool life in ferrous materials
• Plug chamfer provides gradual thread engagement for smooth lead-in
• H2 thread limit produces Class 2B fit for standard 2-56 UNC fastener compatibility
• HSS construction offers toughness in interrupted cuts and varied feed conditions
• Right-hand thread direction for standard tapping setups

Compatibility

Designed for tapping 2-56 UNC threads in cast iron, ductile iron, stainless steel, and steel workpieces. Compatible with standard tap holders, T-handle wrenches, and CNC rigid-tapping setups accepting the 0.141-inch shank diameter. Coolant-through tooling is not required.

Installation Notes

Install and remove taps only with the machine or tapping arm at a complete stop. Secure the workpiece firmly before tapping to prevent movement during thread cutting. Use an appropriate cutting fluid for the workpiece material to reduce heat and extend tap life. Follow shop safety practices and applicable OSHA machine guarding requirements when operating drilling or milling equipment.